Air-pump



AIR PUMP.

Patented Jan. 3,1882.

i y UNITED STATES l PATENT OFFICE.

HENRY HUIIPEREVILLE, or MouNTvILLE, PENNSYLVANIA.

AIR-PUMP.

SPECIFICATION forming part of Letters Patent No. 251,886, dated January 31, 1882.

Application tiled October 25, 1881. (No model.)

Same.

The object of my present invention is the improvementof thei'orm ofair-pumpsfor atomizers, Letters Patent for which were granted to me July 26,1881, No. 244,901, which was designed to provide suitable means for forcing a current of air through an atomizer of the form also patented to me March 2,1880.

My improvement consists in dispensing with certain features of my patent of July 26, 1881, such as an outer air passage or chamber annexed to and leading from the front to the rear of the cylinder and communicating with said cylinder by means of certain apertures, also with certain valves, diaphragm, outer apertures, stuffing-box, 8vo., constituting a double force-pump, and in constructing as a substitute therefor a single force-pump more simple in construction and efficient in operation. I also show mypresent improvement attached to my spring-dampener of March 2, 1880 5 but it will be perfectly obvious that it may be applied toV many other forms of atomizers.

My improvementis illustrated in the accompanying drawings, in which Figure l represents an exterior view of the same with the spray-dampener attached thereto, and Fig. 2 a longitudinal sectionalview of my device.

A indicates a cylinder, constructed of metal or other suitable material, with a convex bottom, b, and4 provided with a nozzle, C, over which is drawn a rubber cover, o, to serve as a tight packing for the tube of the atomizer when the latter is attached thereto. The bottom b is made convex to give it greater strength and afford a stronger and more durable support to the nozzle U. Its inner concave surface also constitutes a sort of cup for holding oil by which the parts are lubricated. Theinn er end of said nozzleis extended through said bottom and into the body of the cylinder for a short distance, as shown, .in order that the oil used as and for the purpose just mentioned may not be blown into and through the atomizer, and thus mingle with or injure the contents of the atomizer and obstruct itsoperation.

I) indicates the piston-rod, and E the airtight piston, the latter being constructed of a disk of rubber or leather, f, held between two Ymetal plates, g and h, by means of nuts Z and l', and with its edges turned down over the lower plate. The lower metal plate, h, is made slightly concave on its under side in order that its edges may not cut the disk, and to give to the piston a close and neat tit to the walls of the cylinder.

' It will be seen that the face of the lower nut, l', is made perfectly flat, so that when the piston is forced down its entire length the face of the nut will t closely upon the inner mouth of the nozzle C. l j

L is a cap, which is screwed onto the cylinder. Through this cap the piston-rod is moved, and the cap is made of the elongated form shown for the express purpose ot' better supporting the piston-rod in ahorizontal position when the rod is drawn back its entire length. Gap L is also provided with one or more apertures, m, for the admission of air into the cylinder behind the piston and for its egress when the piston is raised.

In operation air is drawn through the atomizer directly into the cylinder by way of nozzle C, and in forcing the air-tight piston E quickly down upon the nozzle G, a strong current of air is forced into the atomizer, the contents of which are forced out as efficiently as with a double force-pump, and at the same time the use of diaphragms, valves, outer apertures, chambers, and stuffing-box are dispensed with, which greatly lessens the cost of production and the liability to get out otorder.

An additional plate or diaphragm, it' desired,

may be set in the elongated cap L at i, through which the piston-rod may be passed as an additional support and to make a closer joint; but in practice it is thought the use of this plate will-be unnecessary.

Having thus described my invention, what I IOO claim, and desire to secure by Letters Patent, gated screweap L, bottom b, piston E, and nozro is zle C', extending into the pump-cylinder, subl. An (nir-pump provided with a convexostayntially as described.

concave bottom, in combination with a nozzle In testimony whereof I affix my signature in which extends into the pump-cylinder for a presence of two Witnesses. sufficient distance, as and for the purpose de- HENRY' HUMPHREVILLE. scribed. Witnesses:

2. The combinatiomin an air-pump designed W. H. MOOR-E, to be used with atomizers, of cylinder A, elon- C. C. KAUFFMAN. 

